Here are the top stories and upcoming coverage plans for Reuters text service as of 11 a.m. GMT/6 a.m. ET. For a full schedule of news and events, go to our editorial calendar on Reuters Connect. TOP STORIES GLOBAL UKRAINE-CRISIS/ Ukraine warns of more Russian attacks as fighting rages in Donetsk LVIV/KYIV, Nov 28 (Reuters) - Ukrainian President Volodymyr Zelenskiy cautioned on Sunday that Russia was "planning new strikes" on his country, urging defence forces and citizens to be prepared to withstand a new week of strain on the power grid amid freezing temperatures. SOUTHKOREA-STRIKE/TRUCKERS South Korea's striking truckers say...